WO2014023039A1

WO2014023039A1 - Organic display apparatus and production method therefor

Info

Publication number: WO2014023039A1
Application number: PCT/CN2012/080240
Authority: WO
Inventors: 黄泰钧
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2012-08-06
Filing date: 2012-08-16
Publication date: 2014-02-13
Also published as: CN102800815B; CN102800815A

Abstract

Disclosed are an organic display apparatus and a production method therefor. The organic display apparatus comprises a scan line (201), a data line (202) and a power line (203), wherein the scan line (201), the data line (202) and the power line (203) are arranged in a crossing manner such that an area provided with a display section (30) is defined; the display section (30) is provided with an organic light emitting diode comprising an anode layer (32); the power line (203) is provided with a conductive layer (22) thereon; and the anode layer (32) of the organic light emitting diode and the conductive layer (22) are formed by means of etching from the same material layer.

Description

[Invention name established by ISA according to Rule 37.2] Organic display device and method of fabricating the same

Technical field

The present invention relates to the field of display technologies, and in particular, to an organic light emitting diode display and a method of fabricating the same.

Background technique

Organic Electroluminescence Display (Organic Electroluminesence Display, OELD) is a new-generation display device, which generally uses an Organic Light Emitting Diode (OLED) as a light-emitting display component.

The organic light emitting diode emits light by sandwiching an organic light emitting material between a transparent anode and a metal reflective cathode to apply a voltage to the organic light emitting material. Since the organic electro-laser display does not require a liquid crystal and a conventional backlight module, it can be manufactured to be lighter and thinner. Compared with other types of flat panel display devices, the OLED consumes less power, and the OLED can operate over a wide temperature range and is manufactured. The cost is lower, so it is getting more and more widely used.

Please refer to FIG. 1. FIG. 1 is a cross-sectional structural view of a display device in the prior art, and FIG. 2 is a schematic top plan view of the display device.

In FIG. 2, a data line 101, a scan line 102, and a power line 103 are included, and an area defined by the above three intersections is provided with an element area 18 and a display area 19. Referring to FIG. 1, a switching element 12 is formed in the element region 18, and the switching element 12 is formed on a transparent substrate 11. An organic light emitting diode (OLED) is formed in the display region 19, and includes a transparent substrate 11, an anode layer 13, a hole transport layer 14, an organic light emitting layer 15, an electron transport layer 16, and a cathode layer 17 in this order from bottom to top.

The organic display device shown in FIG. 3 and FIG. 4 is an active organic display device, and the internal organic light-emitting diode is mainly driven by a current transmitted by a power line, and in order to ensure that current can be transmitted to each organic light-emitting diode, The width L1 of the power line is generally large, so that there is a voltage drop during the transmission current, resulting in uneven voltage distribution to the organic light-emitting diodes, resulting in different brightness of the organic light-emitting diodes, reducing display quality. .

Moreover, if the width L1 of the power line is generally large, the space of the display area 19 will be occupied, so that the transmittance of the organic display device is low, which affects the display quality.

Therefore, the above technical problems existing in the prior art need to be solved.

technical problem

An object of the present invention is to provide an organic display device to solve the problem in the prior art that the width of the power line is wide, the transmittance of the organic display device is reduced, and the voltage drop occurs during the transmission of the current, resulting in organic The technical problem of the brightness of the light-emitting diodes is different.

Still another object of the present invention is to provide a method for fabricating an organic display device, which solves the problem in the prior art that the transmittance of the organic display device is reduced due to the wide width of the power supply line, and the voltage drop occurs during the transmission current. A technical problem that causes the brightness of each organic light-emitting diode to be different.

Technical solution

The invention constructs an organic display device, which comprises a scan line, a data line and a power line, wherein the area defined by the intersection of the scan line, the data line and the power line is provided with a display area and an element area;

The display area is provided with an organic light emitting diode, and the organic light emitting diode comprises an anode layer; the power line is formed with a conductive layer; wherein the anode layer of the organic light emitting diode and the conductive layer are etched on the same material layer Formed, and the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer.

In an embodiment of the invention, the conductive layer comprises at least one metal layer, and the anode layer is formed by a layer of transparent conductive oxide.

In an embodiment of the invention, the material layer includes a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked;

Wherein the conductive layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer; and the anode layer is formed by a first transparent conductive oxide layer.

In an embodiment of the invention, the material of the transparent conductive oxide layer is indium tin oxide, and the material of the metal layer is copper.

In an embodiment of the present invention, the component area is provided with a switching element, and the switching element is respectively connected to the scan line, the data line, the power line, and the organic light emitting diode for controlling the organic light emitting diode The switch of the tube.

Another object of the present invention is to provide an organic display device to solve the problem in the prior art that the width of the power supply line is wide, the transmittance of the organic display device is reduced, and the voltage drop occurs during the transmission of the current. The technical problem of the brightness of organic light-emitting diodes is different.

In order to solve the above technical problem, the present invention constructs an organic display device including a scan line, a data line, and a power line, and a region defined by the intersection of the scan line, the data line, and the power line is provided with a display area;

The display area is provided with an organic light emitting diode, and the organic light emitting diode comprises an anode layer; the power line is formed with a conductive layer; wherein the anode layer of the organic light emitting diode and the conductive layer are etched on the same material layer form.

In an embodiment of the invention, the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer;

The conductive layer includes at least one metal layer, and the anode layer is formed of a layer of transparent conductive oxide.

In an embodiment of the invention, the material layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked;

In an embodiment of the invention, the area defined by the intersection of the scan line, the data line and the power line further includes an element area, the element area is provided with a switching element, and the switching element is respectively connected to the scan line, the data line, and the power source a wire and an organic light emitting diode for controlling a switch of the organic light emitting diode.

In order to solve the above technical problem, the present invention constructs a method of fabricating an organic display device, the method comprising the following steps:

Providing a transparent substrate on which a scan line, a data line, and a power line are formed, wherein an area defined by the intersection of the scan line, the data line, and the power line includes a display area;

Coating a material layer on the transparent substrate on which the scan lines, data lines, and power lines have been formed, and etching the material layer to form an electrically conductive conductive layer on the power line. The display area of the transparent substrate forms a light transmissive anode layer;

The hole transport layer, the organic light-emitting layer, the electron transport layer, and the cathode layer are continuously formed on the transparent substrate on which the anode layer has been formed to form an organic light-emitting diode in the display region of the transparent substrate.

In an embodiment of the invention, the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer; the conductive layer comprises at least one metal layer, and The anode layer is formed from a layer of transparent conductive oxide.

In an embodiment of the invention, the material layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked; wherein the conductive layer comprises a first transparent conductive oxide layer and a metal And a second transparent conductive oxide layer; and the anode layer is formed of a first transparent conductive oxide layer.

In an embodiment of the invention, the area defined by the intersection of the scan line, the data line and the power line further includes an element area;

In the process of forming the scan line, the data line, and the power line, a switching element is further formed in the element region, and the switching element is respectively connected to the scan line, the data line, the power line, and the organic light emitting diode to control The switch of the organic light emitting diode.

Beneficial effect

Compared with the prior art, in the process of forming an anode layer for forming an organic light emitting diode, the present invention applies a material layer on the entire transparent substrate, and then performs a mask etching process on the material layer to make a material corresponding to the power line. The layer forms a conductive layer to achieve electrical conduction; and the corresponding material layer of the display region forms an anode layer. Since the conductive layer can conduct electricity, the conductive layer can share the conductive function of the power line, thereby reducing the volume of the power line, for example, reducing the width of the power line, thereby increasing the aperture ratio of the organic display device. In turn, the voltage drop problem can be avoided, so that the organic light-emitting diodes emit light uniformly.

DRAWINGS

1 is a cross-sectional structural view of an organic display device in the prior art;

2 is a schematic top plan view of an organic display device in the prior art;

3 is a cross-sectional structural view showing a preferred embodiment of an organic display device of the present invention;

4 is a top plan view showing a preferred embodiment of an organic display device according to the present invention;

5A-5C are schematic views showing the etching of a material layer to form a conductive layer and an anode layer in the present invention;

FIG. 6 is a schematic flow chart of a preferred embodiment of a method of fabricating an organic display device according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The following description of the various embodiments is provided to illustrate the specific embodiments of the invention. The directional terms mentioned in the present invention, such as "upper", "lower", "before", "after", "left", "right", "inside", "outside", "side", etc., are merely references. Attach the direction of the drawing. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention. In the figures, structurally similar elements are denoted by the same reference numerals.

4 is a top plan view of a preferred embodiment of an organic display device according to the present invention. The organic display device includes a scan line 201, a data line 202, and a power line 203, the scan line 201, the data line 202, and a power line. 203 can be formed in the same layer and formed in the same process. The area defined by the intersection of the scan line 201, the data line 202, and the power line 203 includes an element area 20 and a display area 30.

FIG. 3 is a cross-sectional structural view corresponding to the element region 20 and the display region 30 of FIG. 4. Wherein the element region 20 is provided with a switching element 21, such as a thin film field effect transistor (Thin Film) Transistor (TFT), a conductive layer 22 is formed on the power line 203. Specifically, the conductive layer 22 is formed on the switching element 21, the scan line 201, and the data line 202. In the embodiment shown in FIG. 3, the conductive layer 22 includes a first transparent conductive oxide layer 221, a metal layer 222, and a second transparent conductive oxide layer 223 in this order.

Referring to FIG. 3 , the display area 30 is provided with an organic light emitting diode composed of a transparent substrate 31 , an anode layer 32 , a hole transport layer 33 , an organic light emitting layer 34 , an electron transport layer 35 , and Cathode layer 36. Under bias conditions, electrons from the cathode layer 36 and holes from the anode layer 32 recombine at the organic light-emitting layer 34, causing the organic light-emitting layer 34 to emit a light source, and the light source emitted from the organic light-emitting layer 34 sequentially passes through the hole transport layer 33. The anode layer 32 and the transparent substrate 31 are emitted.

In the present invention, the switching element 21, the scanning line 201, the data line 202, and the power supply line 203 are formed between the transparent substrate 31 and the conductive layer 22, and may be formed by the same process. The conductive layer 22 and the anode layer 32 of the organic light emitting diode are formed on the basis of the same material layer. The first transparent conductive oxide layer 221, the second transparent conductive oxide layer 223 of the conductive layer 22, and the anode layer 32 of the organic light emitting diode are all formed of the same material, such as indium tin oxide, to make the light transparent. Over. The metal layer 222 of the conductive layer 22 is formed of an electrically conductive material, such as metallic copper.

Referring to FIG. 5A-5C together, FIGS. 5A-5C are schematic views showing the process of forming the conductive layer 22 and the anode layer 32 of the organic light emitting diode on the same material layer.

In FIG. 5A, referring to FIG. 3, after the switching element 21, the scan line 201, the data line 202, and the power line 203 are formed on the transparent substrate 31, a material layer 50 is coated on the transparent substrate 31. The material layer 50 includes a first transparent conductive oxide layer 51, a metal layer 52, and a second transparent conductive oxide layer 53.

In FIG. 5B, the material layer 50 is subjected to a first etching treatment, such as a yellow photolithography etching process: a photoresist layer is formed on the material layer 50, and then the material layer 50 is irradiated with light. Etching is performed to form the structure illustrated in Figure 5B. The area A corresponds to the power line 203, and the material layer 50 in the area is formed as the first transparent conductive oxide layer 221, the metal layer 222 and the second transparent conductive oxide layer 223 of the conductive layer 22; The organic light emitting diode is formed in the region, and the material layer 50 of the region still includes the first transparent conductive oxide layer 51, the metal layer 52, and the second transparent conductive oxide layer 53.

In FIG. 5C, the material layer 50 is subjected to a second yellow light lithography process: a photoresist layer is coated on the formed conductive layer 22, and then subjected to a light etching process to make the material layer of the B region. Only the first transparent conductive oxide layer 51 remains, and the anode layer 32 forming the organic light emitting diode is formed.

It is not difficult to see from the above description that in the process of fabricating the anode layer 32 for forming an organic light emitting diode, the material layer 50 has at least one transparent conductive oxide layer by coating a material layer 50 over the entire transparent substrate 31. At least one electrically conductive metal layer, after which the material layer 50 is subjected to a mask etching process, so that the material layer 50 corresponding to the power line 203 retains at least one transparent conductive oxide layer and at least one metal layer as the conductive layer 22, thereby The conductive layer is realized; and the material layer 50 corresponding to the display region 30 retains only one transparent conductive oxide layer as the anode layer 32.

Since the conductive layer 22 can conduct electricity, the conductive layer 22 can share the conductive function of the power line 203, thereby reducing the volume of the power line 203, for example, reducing the width L2 of the power line, where L2< L1 (please refer to Figure 2 together), so that the aperture ratio of the organic display device can be increased. In turn, the life of the panel is increased. Moreover, since the width L2 of the power supply line becomes small, the problem of excessive voltage drop can be avoided, and the brightness of each organic light emitting diode is made uniform, thereby improving the uniformity of panel display.

In some other embodiments, the material layer 50 can also be other multilayer structures, such as a two-layer structure, that is, a transparent conductive oxide layer including one layer and a metal layer of one layer. Of course, it may also be a four-layer structure, that is, sequentially including a transparent conductive oxide layer, a metal layer, a transparent conductive oxide layer, a metal layer, or the like, as long as the anode layer 32 can be formed in the display region 30 by etching and formed on the power line 203. The conductive layer 22 may be within the scope of the present invention, and is not enumerated here.

FIG. 6 is a schematic flow chart of a preferred embodiment of a method for fabricating an organic display device according to the present invention.

In step S601, a transparent substrate 31 is provided, and a switching element 21, a scanning line 201, a data line 202, and a power supply line 203 are formed on the element region 20 of the transparent substrate 31. Wherein the switching element 21 is, for example, a TFT transistor.

In step S602, a material layer 50 is coated on the transparent substrate 31, wherein the material layer 50 covers the switching element 21, the scanning line 201, the data line 202, the power supply line 203, and the display area 30 of the organic display device (FIG. 4).

In step S603, the material layer 50 is subjected to a mask etching process to form a conductive conductive layer 22 on the power line 203, and a light-permeable layer is formed on the corresponding display area of the transparent substrate 31. Anode layer 32.

The conductive layer 22 and the power line 203 are electrically connected together, and the width L2 of the power line 203 can be designed to be smaller.

In step S604, the hole transport layer 33, the organic light-emitting layer 34, the electron transport layer 35, and the cathode layer 36 are continuously formed on the anode layer 32 to form an organic light-emitting diode in the display region 30.

Wherein the material layer 50 is a multi-layer structure comprising at least one layer of a light transmissive transparent conductive oxide layer and at least one electrically conductive metal layer. For example, the material of the transparent conductive oxide layer is indium tin oxide, and the material of the metal layer is copper.

In the present invention, the material layer 50 may have a two-layer structure, that is, a transparent conductive oxide layer including one layer and a metal layer of one layer, or a three-layer structure, for example, please refer to FIG. 5A-5C, that is, sequentially The first transparent conductive oxide layer 51, the metal layer 52, and the second transparent conductive oxide layer 53 may be formed by forming an anode layer 32 in the display region 30 and forming a conductive layer 22 on the power source line 203 by etching. Within the scope of protection of the present invention, it is not enumerated here. For the specific process of forming the conductive layer 22 and the anode layer 32, please refer to FIGS. 5A-5C and the descriptions of FIGS. 5A-5C, and details are not described herein again.

In the process of forming an anode layer of an organic light emitting diode, a material layer is coated on the entire transparent substrate, and then the material layer is subjected to a mask etching process, so that a material layer corresponding to the power line forms a conductive layer, thereby Conductive is achieved; and the material layer corresponding to the display area forms an anode layer. Since the conductive layer can conduct electricity, the conductive layer can share the conductive function of the power line, thereby reducing the volume of the power line, for example, reducing the width of the power line, thereby increasing the aperture ratio of the organic display device. In turn, the voltage drop problem can be avoided, so that the organic light-emitting diodes emit light uniformly.

In the above, the present invention has been disclosed in the above preferred embodiments, but the preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various modifications without departing from the spirit and scope of the invention. The invention is modified and retouched, and the scope of the invention is defined by the scope defined by the claims.

Embodiments of the invention

Industrial applicability

Sequence table free content

Claims

An organic display device comprising a scan line, a data line and a power line, wherein the area defined by the intersection of the scan line, the data line and the power line is provided with a display area and an element area;

The display area is provided with an organic light emitting diode, and the organic light emitting diode comprises an anode layer; the power line is formed with a conductive layer; wherein the anode layer of the organic light emitting diode and the conductive layer are etched on the same material layer Formed, and the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer.
The organic display device of claim 1, wherein the conductive layer comprises at least one metal layer and the anode layer is formed of a layer of transparent conductive oxide.
The organic display device according to claim 2, wherein the material layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked;

Wherein the conductive layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer; and the anode layer is formed by a first transparent conductive oxide layer.
The organic display device according to claim 2, wherein the material of the transparent conductive oxide layer is indium tin oxide, and the material of the metal layer is copper.
The organic display device according to claim 1, wherein the element region is provided with a switching element, and the switching element is respectively connected to the scan line, the data line, the power line, and the organic light emitting diode for controlling the Switch for organic light-emitting diodes.
An organic display device comprising a scan line, a data line and a power line, wherein the area defined by the intersection of the scan line, the data line and the power line is provided with a display area;

The display area is provided with an organic light emitting diode, and the organic light emitting diode comprises an anode layer; the power line is formed with a conductive layer; wherein the anode layer of the organic light emitting diode and the conductive layer are etched on the same material layer form.
The organic display device according to claim 6, wherein the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer;

The conductive layer includes at least one metal layer, and the anode layer is formed of a layer of transparent conductive oxide.
The organic display device according to claim 7, wherein the material layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked;

Wherein the conductive layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer; and the anode layer is formed by a first transparent conductive oxide layer.
The organic display device according to claim 7, wherein the material of the transparent conductive oxide layer is indium tin oxide, and the material of the metal layer is copper.
The organic display device according to claim 6, wherein the region defined by the intersection of the scan line, the data line and the power line further comprises an element region, the element region is provided with a switching element, and the switching element is respectively connected to the scan line, A data line, a power line, and an organic light emitting diode are used to control the switch of the organic light emitting diode.
A method of fabricating an organic display device, wherein the method comprises the following steps:

Providing a transparent substrate on which a scan line, a data line, and a power line are formed, wherein an area defined by the intersection of the scan line, the data line, and the power line includes a display area;

Coating a material layer on the transparent substrate on which the scan lines, data lines, and power lines have been formed, and etching the material layer to form an electrically conductive conductive layer on the power line. The display area of the transparent substrate forms a light transmissive anode layer;

The hole transport layer, the organic light-emitting layer, the electron transport layer, and the cathode layer are continuously formed on the transparent substrate on which the anode layer has been formed to form an organic light-emitting diode in the display region of the transparent substrate.
The method of fabricating an organic display device according to claim 11, wherein the material layer comprises a superposed at least one electrically conductive metal layer, and at least one light transmissive transparent conductive oxide layer; the conductive layer comprises at least A metal layer, and the anode layer is formed of a layer of transparent conductive oxide.
The method of fabricating an organic display device according to claim 12, wherein the material layer comprises a first transparent conductive oxide layer, a metal layer and a second transparent conductive oxide layer which are sequentially stacked; wherein the conductive layer comprises the first a transparent conductive oxide layer, a metal layer, and a second transparent conductive oxide layer; and the anode layer is formed of a first transparent conductive oxide layer.
The method of fabricating an organic display device according to claim 12, wherein the material of the transparent conductive oxide layer is indium tin oxide, and the material of the metal layer is copper.
The method of fabricating an organic display device according to claim 11, wherein the region defined by the intersection of the scan line, the data line and the power line further comprises an element region;

In the process of forming the scan line, the data line, and the power line, a switching element is further formed in the element region, and the switching element is respectively connected to the scan line, the data line, the power line, and the organic light emitting diode to control The switch of the organic light emitting diode.